Hoisting-machines



A. Y. PARMELE.

CLUTCI'IING APPARATUS FOR HOISTINGMACI-IINES.

Nn.185,567. Patented D .19,1876.

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Be it khown that `I,N`I R'W Y. PARMrgLE, of New Haven, in the county of and State of Connecticiitlliave i new Improvelnenti'r W I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawin gs constitute part of this specification, and represent, in

lFigure l, plan view; Fig. 2, front view; Fig. 3, end view; Fig. 4, longitudinal section; Fig. 5, detached part.

This invention relates to an improvement in apparatus for hoisting and like purposes, the objectbeing to connect the power with the hoisting-drum by means of a frictional band; and it consists in th'e mechanism hereafter described, and more particularly recited in the claims.

A represents the frame, upon which the mechanism is arranged; B, the shaft, supported in suitable bearings B. Loose upon this shaft is the drum O, which is constructed with, or has attached to it, a wheel, D, preferably grooved upon its edge. Rigidly attached to the shaft is an arm, E, or, if preferred, this may be a wheel, to which the, hoisting-power is communicated. If it be not a wheel, then power is applied to impart a continuous revolution to the shaft B and the arm E. In the arm E a shaft, F, is arranged with a head, G, upon the side next the wheel D, and in this head there are two studs, a b, as shown in Fig. 5, and broken lines, Fig. 3. To one of these studs b one end of a metallic or other suitable strap, L, is attached, and to the other stud a the other end of the said strap is attached, lthe strap passing around the periphery of the wheel D, the flanges of the groove of which prevent the said strap from running off the wheel. The studs a b are both eccentric to the axis of the shaft F; hence, when the shaft F is turned in the direction as indicated by the arrow, Fig. 5, the two ends attached to their respective studs, will be drawn in opposite directions-say, to position denoted in broken lines, Fig. 5until 185:56?, atteint Hoistin'gA and ceher 19, 1876;Lapplication iiied thvbandl producessufcient friction in the 'wheelfDI to cause it to 'turn with the' shaft B, to which the arm E and shaft F are securely att-ached, but when"the studs a, b are'in their hemmt-'condition'then the shaft B, with the arm E and stud-shaft F, together with the band L, all revolve freely, while the drum remains stationary. To thus turn the shaft F to cause the power to engage the hoistingdrum a lever, N, is attached to the stud-shaft F, and extends inward, its inner end toothed, forming a segmental gear, n, and loose upon the shaft is a pinion, P, which engages into the teeth of the lever N. The hub of the pinion P is elongated, and is grasped by a pair of frictional levers, R R, or any suitable device, which will engage or release the said pinion. When the friction upon the pinion P is removed, then the lever N and the pinion all revolve freely with the shaft B through their connections to the lever E; but hy griping the pinion P by the levers R R, or otherwise, produce sufficient friction to arrest its revolution. rlhe arm E, still revolving, will carry the lever N forward to the position seen in Fig. 3. The engagement of the teeth of the lever N with the stationary pinion will cause the lever to turn on its own axis, and consequently turn the shaft F until the band L engages the wheel of the hoisting-drum. The friction produced upon the pinion P should only be sufficient to cause the shaft F to turn till it produces the required friction upon the hoisting-drhm. The power will then overcome the friction upon the pinion P, and the revolving lever N will cause the pinion to turn with it and the arm E, the friction on the pinion P, however, holding the lever N back to maintain thefriction upon the hoistingdrum, thus connecting the parts together, so that the drum will wind up the cord or chain and raise the weight. By loosening the friction upon the pinion P the lever N will return to its normal condition, and allow the weight to descend. A resistance for such descent may be made by producing friction upon the pinion P less than enough to cause the band L to stop the wheel D, the friction in that case only retarding the revolution of the hoistingedrllrn., ',Thefraising or lovve "ng `they?! weight may at any time be stopped," an'dthei weight held in suspense by adjustingthe-fric-r tion upon the pinion P. A spring, 'df ai-1 ranged upon Ethe arm E,which operaltes-gipony"4 thelever N to cause it to returnE to' itsfnorv mal conditionwhen released from. :the,powerof the pinion P.

While the friction upon the pinion Pisbest produced -hy-graspihg-levers, itvvillA be evi dent to mechanics skilled in the art thatzother; frictional device to acconlplish the same object maybe applied to the pinion. .l f a.

Other devices may be employedv for turning the stud-shaft F than through the instrumentality of the lever N, but this is believed to Abe thebest arrangement.

f1. 4In a hoistingapparatus the Vcoinbjnatijon of the following elements: a driving-shaft; a.` hoisting-drum, loose on. said shaft; an ,anni o r wheel, rigidly attached to the said,shaft";r.a

,A gaging with a pinionvlopsqll respectively, attached to the said studs, Ysubs attached thereto, the ends goffthe.` said band,

respectively, attachedto the said studs," and a lever attachedto the shaft? by which said studs are rotated, extending inward and enpQn theshaft,- f' 'thet pair of studs hung on said wheel on armfec:V 

